desktop: make desktop build more portable

this should help on MacOS

thanks to MikeS for his assistance

libraries/Desktop/Desktop.mk

@@ -24,6 +24,14 @@
 # SUCH DAMAGE.
 #
 
+#
+# Save the system type for later use.
+#
+SYSTYPE			:=	$(shell uname)
+
+# force LANG to C so awk works sanely on MacOS
+export LANG=C
+
 #
 # Locate the sketch sources based on the initial Makefile's path
 #
@@ -85,13 +93,18 @@ ifneq ($(MAKECMDGOALS),configure)
 HARDWARE=desktop
 BOARD=desktop
 
-CXX			:=	g++
-CC			:=	gcc
-AS			:=	gcc
+ifeq ($(SYSTYPE),Darwin)
+  CXX			:=	c++
+  CC			:=	cc
+  AS			:=	cc
   AR			:=	ar
-LD			:=	g++
-GDB			:=	gdb
-OBJCOPY			:=	objcopy
+endif
+
+CXX			?=	g++
+CC			?=	gcc
+AS			?=	gcc
+AR			?=	ar
+LD			:=	$(CXX)
 
 # Find awk
 AWK			?=	gawk
@@ -114,7 +127,7 @@ ASOPTS			=	-assembler-with-cpp
 CXXFLAGS		=	-g $(DEFINES) $(OPTFLAGS) $(DEPFLAGS) $(CXXOPTS)
 CFLAGS			=	-g $(DEFINES) $(OPTFLAGS) $(DEPFLAGS) $(COPTS)
 ASFLAGS			=	-g $(DEFINES) $(DEPFLAGS) $(ASOPTS)
-LDFLAGS			=	-g $(OPTFLAGS) -Wl,--gc-sections -Wl,-Map -Wl,$(SKETCHMAP)
+LDFLAGS			=	-g $(OPTFLAGS)
 
 LIBS			=	-lm
 

libraries/Desktop/support/FastSerial.cpp

@@ -33,7 +33,6 @@
 #include "FastSerial.h"
 #include "WProgram.h"
 #include <unistd.h>
-#include <pty.h>
 #include <fcntl.h>
 
 #include <stdio.h>
@@ -62,6 +61,10 @@
 # define FS_MAX_PORTS   1
 #endif
 
+#ifndef MSG_NOSIGNAL
+# define MSG_NOSIGNAL 0
+#endif
+
 static struct tcp_state {
 	bool connected; // true if a client has connected
 	int listen_fd;  // socket we are listening on
@@ -132,7 +135,7 @@ static void tcp_start_connection(unsigned int serial_port, bool wait_for_connect
             fprintf(stderr, "accept() error - %s", strerror(errno));
             exit(1);
         }
-		setsockopt(s->fd, SOL_TCP, TCP_NODELAY, &one, sizeof(one));
+		setsockopt(s->fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
 		s->connected = true;
     }
 }